The 'Stranger Things' star reveals Marvel's extreme secrecy measures, including no script until she landed in London.

Sadie Sink is one of the most recognizable faces in Hollywood, but even she was not exempt from Marvel Studios' legendary obsession with secrecy. The actress, set to make her debut in the Marvel Cinematic Universe later this month in Spider-Man: Brand New Day, has revealed she was offered the part under extraordinary conditions designed to protect the film's biggest mysteries .

In a recent interview, the 22-year-old star explained that she was given the role without an audition, a decision stemming from her previous work with director Destin Daniel Cretton on the 2017 drama The Glass Castle . However, the unusual process did not end there. Sink disclosed that she did not receive the script for the highly anticipated blockbuster until she had already arrived in London to begin filming .

This extreme level of discretion has kept her character completely out of the public eye. She has not appeared in any trailers or promotional materials, making her one of the most closely guarded secrets in the upcoming film . When asked how she manages to keep such a significant secret, Sink offered a blunt response: "You just don't share the secret, it's not that hard" .

Despite the immense pressure of joining one of cinema's biggest franchises, Sink credited her co-star Tom Holland for making the transition seamless . She described Holland as welcoming, relaxed, and open, noting that he helped her feel at ease as an "outsider" stepping into the established world of the MCU .

"I knew that Marvel was a big deal and had a big brand, especially Spider-Man," Sink remarked, acknowledging the scale of the project. "I know there's a huge fan base, but it feels really big. I think these blockbuster movies are a whole different beast" .

While Marvel remains tight-lipped, internet speculation has run rampant, with the prevailing fan theory suggesting she is playing a version of Jean Grey, potentially setting the stage for the introduction of the X-Men into the MCU . The official synopsis for the film hints that Peter Parker is now operating full-time as Spider-Man, navigating a world that has forgotten his identity while facing a powerful new threat .

Sink joins returning cast members Zendaya and Jacob Batalon, alongside Marvel veterans Mark Ruffalo and Jon Bernthal, who will appear as the Hulk and the Punisher, respectively . The shroud of secrecy surrounding Sink's character is likely to remain intact until Spider-Man: Brand New Day swings into theaters on July 31 .